ambassador to libya. >>> money out the window. bank robbery suspects hurl cash during a high-speed police chase. >>> baby guz. what duchess kate has been turning down sparking pregnancy rumors. >>> good morning. i'm mara schiavocampo. this is "first look" on msnbc. >>> we begin this morning with firing back. in response to deadly attacks in libya that killed a u.s. ambassador and three diplomats, an elite group of marines has been sent to ramp up security in libya's capital. this as the obama administration responds to criticism from republican rival mitt romney while investigating whether the attacks were specifically coordinated to take place on the anniversary of 9/11. nbc's tracie potts has more from washington. good morning. >> reporter: march rarks here on capitol hill, the senate approved a resolution honoring the victims and calling this attack unacceptable and unjust find. a nation in mourning as the bodies of four americans including ambassador chris stevens arrive home. flags are at half staff in d.c. overnight, a vigil